Friede Publications · Penrose Pub
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| A Guide to 199 Michigan Waterfalls | 978-0-9769629-0-8 | 2007 | Penrose Laurie · Ann A. Penrose |
| A Guide to 199 Michigan Waterfalls | 978-0-923756-15-4 | 1988 | Laurie Penrose · Ruth Penrose |
| A Traveler's Guide to 116 Michigan Lighthouses | 978-0-9769629-1-5 | 2008 | Laurie Penrose · Ruth Penrose |
| A Traveler's Guide to 116 Michigan Lighthouses | 978-0-923756-03-1 | 1992 | Laurie Penrose · Ruth Penrose |